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It is possible to do many simple tricks with numbers. Here is one trick. It has several separate steps.

    First, write down your house number. For example, if your address is 73 Lemon Street, you would write down 73. After you write down your house address, next double it, then add five to this double number. For example, if your address was 73 and you doubled it, you would get146. Then, if you added five, you’d get 151.

    Then multiply this number by 50. In our example here, you’ll get 7550. The next step is to add your age to this total. For example, if you’re26 years old, you should add 26 to this total. In our example here, the result would be 7576.

    After that you have to add the number of days in a year, which is 365. In our example here, 365 added to 7576 is 7941.

    The final step is this: Subtract 615 from the number that you have. Take away 615 from the total. In our example, 7941 minus 615 is 7326.

    The result here —7326— is the trick. The first part of the number is the address and the last part of the number is the age of the person. That is, 73 is the address that we started with, and 26 is the age that we used.

1The best title of the passage is________

AThe number tricks

BA trick with numbers

CAn interesting problem

DHow to work out a difficult trick

2. How many steps are there in the trick?

A5

B6

C7

D8

3. Which of the following step is wrong?

AMultiply this number by 2.

BAdd 5 to this number.

CPlus 50 to this number.

DTake 615 away from this total.

4. We may infer from the result________

Ahow many days there are in a year

Bhow old the person is

Chow clever the person is

Dwhere the person lives

5. The third step is________

A+5

B×2

C–365

D+615

 

答案:BCCBA
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